Question
Verify the following:
(-13) × [(-6) + (-19)] = (-13) × (-6) + (-13) × (-19)
(-13) × [(-6) + (-19)] = (-13) × (-6) + (-13) × (-19)
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You will observe that l(XP) = l(YP), l(XA) = l(YA) and l(XB) = l(YB)
Therefore we can conclude that all points on the vertical fold (perpendicular bisector) are equidistant from the endpoints of the horizontal fold.